Furnace



No. 750,759. PATENTBD JAN. ze, 1904. A

R. vs. FRANZ. EURNAGE.

APPLICATION FILED JUNE 24, 1903. N0 MODEL.. 2 SHEETS-SHEET l.

PATENTE) JMLQG, 1904;

R. s. FRANZ. A

APURNACB. APPLICATION TILED JUNE 24. 1903. N0 MODEL. 2 SHEETS-SHEET 2.

UNITED STATES Patented January 26, 1904.

PATENT OEEICE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 750,7 59, dated January26, 1904.

Application filed June 24, 1903. Serial No. 162,833. (No model.)

To @ZZ whom, t ntf/y con/cern:

Be it known that I, ROBERT S. FRANZ, a citizen of the UnitedStates ofAmerica, residing at Etna, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvementsin'Furnaces, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to certain new and useful improvements infurnaces, and has for its object to provide a furnace of particularconstruction, whereinY a perfect combustion will be obtained and everyunit of heat fully utilized.

Another object of my invention is to provide a furnace which will beeconomical in construction, simple to operate, and one wherein any classof fuel may be used. Also either air or steam may be employedv tofacilitate perfect combustion.

Briefly described, my invention comprises a furnace in which the sidewalls have been so constructed that air or steam maybe passed from themto the combustion-chamber, and means also being provided whereby the hotair which generally escapes through the chimney may be conducted to thefire-box and further facilitate the combustion therein.

The invention finally consists in the novel construction, combination,and arrangement of parts to behereinafter more fully described, andspecifically pointed out in the claims.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification, and whereinlike numerals of reference indicate like parts throughout the severalviews, in which Figure 1 is a longitudinal sectional view of my improvedfurnace. Fig. 2 is a cross-sectional view, and Fig. 3 is a horizontalsectional view,through the combustion-chamber. Fig. 4 is a detail view,partly in section, of one of the horizontal flues having formed thereinthe deiiectors.

In carrying out my invention I employ a construction similar to thatillustrated in my Letters Patent No. 715,569, granted me December 9,1902, and in addition to this construction I employ novel means wherebythe hot air which passes between the iues of the boiler and generallyescapes through the chimney may be conducted to the fire-box throughsuitable channels provided therefor in the side walls of the furnace.Between the crown-plate of the boiler 1 andthe boiler-casing 2 I providethe pipes 3, which are located, preferably, near the top of the boiler,these pipes having their ends cut at an angle, as indicated at 4L,whereby as the hot air passes upwardly in the direction of 'the air, asindicated in Fig. 2 of the drawings,V the same will be buifeted'andcarried to the combustionehamber by means of the iiues 5 and the channel6, which lead to the combustion-chamber- The lower sides of the pipes 3are sheared, as indicated at 7, and the sheared portion bent upwardly,as indicated at 8, whereby a deflector is' formed, so that when the heatpasses through the sheared opening 7 the same will be deiiected into thefiues or channels The iues orV channels 5 are formed in the side wallsof the furnace and pass downwardly to the oblong channels 9, also formedin the side walls of the furnace, and connecting with these channels 9and the combustion-chamber are the ports or channels 6. It will thus beseen that all the waste heat from the iiues which generally pass up thechimney is conveyed to the fire-box, whereby a greater combustion isproduced than heretofore realized. To assist this combustion and furtherfacilitate the combustion of the fuel, I provide the pipes 10, whichpass through channels 9, and in said pipes I provide perforations 11.These pipes 10 may be connected to any suitable air-supply orsteam-supply, and in Fig. 1 of the drawings I have illustrated the sameas connected to the steam-dome 12 of the furnace by means of the pipes14: and 15, suit-l able valves 16 and 17 being provided whereby theamount of steam admitted to the combustion-chamber may be controlled.The channels 9 are located upon each side of the fireboX and above thegrates, whereby when the steam is admitted through ports or channels 6the combustion of the fuel will be aided, and to further facilitate thecombustion thereof I provide the cold-airflues 18, which passlongitudinally of the furnace and enter the bridge- Wall 19, asindicated at 20, the inlet to this flue being provided at the rear endof the furnace, as indicated at 2l. y

To assist the hot air and waste heat in passing through the pipes 3 andthe channels 5, a suitable air or steam supply may be passed into thechannels 5, as indicated at 22, the pipe 23 entering the channel 5 atits upper end, whereby the moment the hot air enters the flues 3 andreaches the channels 5 it will be forced down the channels 5 and passout into the combustion-chamber through the channels 6, the steam or airwhich passes out of the apertures or ports 11 of the pipe l0 furtherassisting the hot air to the combustion-chamber.

It has been found by experiment that by my improved construction aperfect form of combustion will be realized in furnaces constructedalong this line, and that the saving of fuel is accomplished and anydegree of heat desired can be readily secured.

While I have herein shown and described a practical embodiment of myinvention, it will be obvious that various slight changes may be made inthe details of construction Without departing from the general spirit ofmy invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a furnace of the type set forth, a plurality of channels formed inthe side walls thereof provided with ports leading therefrom to thecombustion-chamber, steam-pipes mounted in said channels incommunication with said ports, vertical channels formed in the sidewalls of the furnace, horizontal flues located in the smoke-exit andcommunicating with said channels, the lower edges thereof being shearedto form apertures and deflectors, whereby the unconsumed products aredeflected into the said flues, substantially as described.

2. In a furnace, a plurality of channels formed in the side walls of thefurnace, a plurality of ports leading from said channels to thecombustion-chamber, steam-pipes having ports formed therein supported insaid channels, and adapted to be connected to a suitable steam-supply,means for controllingsaid steam-supply, vertical channels formed in theside walls of the furnace, horizontal lues connecting with saidchannels, the ends of said flues adapted to be located adjacent to thecrown-plate of the boiler, the lower edge of said iiues being sheared toform apertures and deflectors, cold-air iiues extending longitudinallyof the furnace and having outlets in the bridge-wall of the furnace,substantially as described.

3. In a furnace, a plurality of channels formed in the side walls of thefurnace, aplurality of ports leading from s aid channels to thecombustionlchamber, air pipes having ports formed therein and supportedin said channels, a suitable air-supply connected to said pipes,vertical channels formed in the side walls of the furnace, horizontaliues connecting with said channels, the ends of said iues adapted to belocated adjacent to the crown-plate of a boiler, the lower edges of saidflues being sheared to form apertures and deflectors, and an air orsteam supply connected to said vertical channels, cold-air iiues passinglongitudinally of the furnace and outlets in the bridge-wall of thefurnace, substantially as described.

In testimony whereof I aiX my signature in the presence of twowitnesses.

ROBERT S. FRANZ. Witnesses:

R. J. FRICKER, H. C. EvERT.

